Microsoft Enterprise Library 5.0 系列(三) Validation Application Block (初级)

企业库提供了一个很强大的验证应用程序模块,特点是:

可以通过配置为你的程序中特定的类来定义规则集.
是为你的类的公有属性,即对外开放的属性进行验证的.

使用企业库验证应用程序模块的优势:

有助于保持一致的验证方法。
包括大多数标准验证,包括.NET数据类型校验.
它让您可以将多个规则集具有相同的类和该类的成员.
它可以让你申请一个或多个规则集时，您验证的对象.

企业库验证应用程序模块提供了下列几种验证方法:

And CompositeValidator
ContainsCharacters Validator
Date Time RangeValidator
Domain Validator
Enum ConversionValidator
Not Null Validator
Object CollectionValidator
Object Validator
Or CompositeValidator
PropertyComparison Validator
Range Validator
Regular ExpressionValidator
Relative Date TimeValidator
String LengthValidator
Type ConversionValidator
Single MemberValidators

企业库验证应用程序模块有2种使用模式:

代码模式.
配置文件模式.

本文讲的是代码模式,配置文件模式在高级篇再介绍

下面介绍如何使用Microsoft Enterprise Library 5.0中的验证应用程序模块的代码模式.

要使用缓存应用程序模块, 需要导入相应的Dll文件,在此我们要导入的是Microsoft.Practices.EnterpriseLibrary. Validation.dll ,System.ComponentModel.DataAnnotations.dll ,并添加需要的引用:

添加引用:

usingMicrosoft.Practices.EnterpriseLibrary.Validation.Validators;
usingMicrosoft.Practices.EnterpriseLibrary.Validation;
usingSystem.Collections.Generic;

　　2.　测试:

using System;

using Microsoft.Practices.EnterpriseLibrary.Validation.Validators;
using Microsoft.Practices.EnterpriseLibrary.Validation;
using System.Collections.Generic;

namespace test
{
class Program
{
staticint index =1;

staticvoid Main(string[] args)
{
//验证Customer类
Validator<Customer> customerValidator = ValidationFactory.CreateValidator<Customer>();

//设置Customer的CustomerName字段为null
Customer myCustomer =new Customer(null);

ValidationResults vr = customerValidator.Validate(myCustomer);
Scan(vr);

//设置Customer的CustomerName
myCustomer.CustomerName ="HuangCong";

vr = customerValidator.Validate(myCustomer);
Scan(vr);

//创建一个日期
DateTime dt =new DateTime(1988, 01, 01);

//创建一个日期验证器
Validator<DateTime> v1 =new DateTimeRangeValidator(DateTime.Parse("2009-01-01"), DateTime.Parse("2010-01-01"));
vr = v1.Validate(dt);
Scan(vr);

dt =new DateTime(2009, 5, 5);
vr = v1.Validate(dt);
Scan(vr);

/*
其他的验证类还有如下这些,大家可以自己实验:

And Composite Validator
Contains Characters Validator
Date Time Range Validator
Domain Validator
Enum Conversion Validator
Not Null Validator
Object Collection Validator
Object Validator
Or Composite Validator
Property Comparison Validator
Range Validator
Regular Expression Validator
Relative Date Time Validator
String Length Validator
Type Conversion Validator
Single Member Validators

参考网站:http://msdn.microsoft.com/en-us/library/ff664694%28v=PandP.50%29.aspx
*/
}

publicclass Customer
{
//Not Null Validator 验证器,验证该属性不能为空值
[NotNullValidator]
publicstring CustomerName;

public Customer(string customerName)
{
this.CustomerName = customerName;
}
}

privatestaticvoid Scan(ValidationResults vr)
{
Console.WriteLine("测试{0}:", index++);
if (!vr.IsValid)
{
Console.WriteLine("出错");
}
else
{
Console.WriteLine("正确");
}
Console.WriteLine("---------------------------------------");
}
}
}

　　3.　运行结果: